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Relativistic Doppler effect: universal spectra and zeptosecond pulses | | S. Gordienko
; A. Pukhov
; O. Shorokhov
; T. Baeva
; | | Date: |
10 May 2004 | | Subject: | Plasma Physics; General Physics | physics.plasm-ph physics.gen-ph | | Abstract: | We report on a numerical observation of the train of zeptosecond pulses produced by reflection of a relativistically intense femtosecond laser pulse from the oscillating boundary of an overdense plasma because of the Doppler effect. These pulses promise to become a unique experimental and technological tool since their length is of the order of the Bohr radius and the intensity is extremely high $propto 10^{19}$ W/cm$^2$. We present the physical mechanism, analytical theory, and direct particle-in-cell simulations. We show that the harmonic spectrum is universal: the intensity of $n$th harmonic scales as $1/n^{p}$ for $n < 4gamma^2$, where $gamma$ is the largest $gamma$--factor of the electron fluid boundary, $p=3$ and $p=5/2$ for the broadband and quasimonochromatic laser pulses respectively. | | Source: | arXiv, physics/0405042 | | Other source: | [GID 1032599] pmid15447348 | | Services: | Forum | Review | PDF | Favorites | |
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